brew/Library/Homebrew/brew.sh

HOMEBREW_VERSION="$(git -C "$HOMEBREW_REPOSITORY" describe --tags --dirty --abbrev=7 2>/dev/null)"
HOMEBREW_USER_AGENT_VERSION="$HOMEBREW_VERSION"
if [[ -z "$HOMEBREW_VERSION" ]]
then
  HOMEBREW_VERSION=">1.2.0 (no git repository)"
  HOMEBREW_USER_AGENT_VERSION="1.X.Y"
fi

# A depth of 1 means this command was directly invoked by a user.
# Higher depths mean this command was invoked by another Homebrew command.
export HOMEBREW_COMMAND_DEPTH=$((HOMEBREW_COMMAND_DEPTH + 1))

onoe() {
  if [[ -t 2 ]] # check whether stderr is a tty.
  then
    echo -ne "\033[4;31mError\033[0m: " >&2 # highlight Error with underline and red color
  else
    echo -n "Error: " >&2
  fi
  if [[ $# -eq 0 ]]
  then
    /bin/cat >&2
  else
    echo "$*" >&2
  fi
}

odie() {
  onoe "$@"
  exit 1
}

safe_cd() {
  cd "$@" >/dev/null || odie "Error: failed to cd to $*!"
}

brew() {
  "$HOMEBREW_BREW_FILE" "$@"
}

git() {
  "$HOMEBREW_LIBRARY/Homebrew/shims/scm/git" "$@"
}

# Force UTF-8 to avoid encoding issues for users with broken locale settings.
if [[ "$(locale charmap 2>/dev/null)" != "UTF-8" ]]
then
  export LC_ALL="en_US.UTF-8"
fi

# Where we store built products; a Cellar in HOMEBREW_PREFIX (often /usr/local
# for bottles) unless there's already a Cellar in HOMEBREW_REPOSITORY.
if [[ -d "$HOMEBREW_REPOSITORY/Cellar" ]]
then
  HOMEBREW_CELLAR="$HOMEBREW_REPOSITORY/Cellar"
else
  HOMEBREW_CELLAR="$HOMEBREW_PREFIX/Cellar"
fi

case "$*" in
  --prefix)            echo "$HOMEBREW_PREFIX"; exit 0 ;;
  --cellar)            echo "$HOMEBREW_CELLAR"; exit 0 ;;
  --repository|--repo) echo "$HOMEBREW_REPOSITORY"; exit 0 ;;
esac

if [[ "$HOMEBREW_PREFIX" = "/" || "$HOMEBREW_PREFIX" = "/usr" ]]
then
  # it may work, but I only see pain this route and don't want to support it
  odie "Cowardly refusing to continue at this prefix: $HOMEBREW_PREFIX"
fi

# Save value to use for installing gems
export GEM_OLD_HOME="$GEM_HOME"
export GEM_OLD_PATH="$GEM_PATH"

# Users may have these set, pointing the system Ruby
# at non-system gem paths
unset GEM_HOME
unset GEM_PATH

# Users may have this set, injecting arbitrary environment changes into
# bash processes inside builds
unset BASH_ENV

# Users may have this set, breaking grep's output.
unset GREP_OPTIONS

HOMEBREW_SYSTEM="$(uname -s)"
case "$HOMEBREW_SYSTEM" in
  Darwin) HOMEBREW_MACOS="1" ;;
  Linux)  HOMEBREW_LINUX="1" ;;
esac

HOMEBREW_CURL="/usr/bin/curl"
if [[ -n "$HOMEBREW_MACOS" ]]
then
  HOMEBREW_PROCESSOR="$(uname -p)"
  HOMEBREW_PRODUCT="Homebrew"
  HOMEBREW_SYSTEM="Macintosh"
  # This is i386 even on x86_64 machines
  [[ "$HOMEBREW_PROCESSOR" = "i386" ]] && HOMEBREW_PROCESSOR="Intel"
  HOMEBREW_MACOS_VERSION="$(/usr/bin/sw_vers -productVersion)"
  HOMEBREW_OS_VERSION="macOS $HOMEBREW_MACOS_VERSION"
  # Don't change this from Mac OS X to match what macOS itself does in Safari on 10.12
  HOMEBREW_OS_USER_AGENT_VERSION="Mac OS X $HOMEBREW_MACOS_VERSION"

  printf -v HOMEBREW_MACOS_VERSION_NUMERIC "%02d%02d%02d" ${HOMEBREW_MACOS_VERSION//./ }
  if [[ "$HOMEBREW_MACOS_VERSION_NUMERIC" -lt "100900" &&
        -x "$HOMEBREW_PREFIX/opt/curl/bin/curl" ]]
  then
    HOMEBREW_CURL="$HOMEBREW_PREFIX/opt/curl/bin/curl"
  fi
else
  HOMEBREW_PROCESSOR="$(uname -m)"
  HOMEBREW_PRODUCT="${HOMEBREW_SYSTEM}brew"
  [[ -n "$HOMEBREW_LINUX" ]] && HOMEBREW_OS_VERSION="$(lsb_release -sd 2>/dev/null)"
  : "${HOMEBREW_OS_VERSION:=$(uname -r)}"
  HOMEBREW_OS_USER_AGENT_VERSION="$HOMEBREW_OS_VERSION"
fi
HOMEBREW_USER_AGENT="$HOMEBREW_PRODUCT/$HOMEBREW_USER_AGENT_VERSION ($HOMEBREW_SYSTEM; $HOMEBREW_PROCESSOR $HOMEBREW_OS_USER_AGENT_VERSION)"
HOMEBREW_CURL_VERSION="$("$HOMEBREW_CURL" --version 2>/dev/null | head -n1 | /usr/bin/awk '{print $1"/"$2}')"
HOMEBREW_USER_AGENT_CURL="$HOMEBREW_USER_AGENT $HOMEBREW_CURL_VERSION"

if [[ -z "$HOMEBREW_CACHE" ]]
then
  HOMEBREW_CACHE="$HOME/Library/Caches/Homebrew"
fi

# Declared in bin/brew
export HOMEBREW_BREW_FILE
export HOMEBREW_PREFIX
export HOMEBREW_REPOSITORY
export HOMEBREW_LIBRARY

# Declared in brew.sh
export HOMEBREW_VERSION
export HOMEBREW_CACHE
export HOMEBREW_CELLAR
export HOMEBREW_SYSTEM
export HOMEBREW_CURL
export HOMEBREW_PROCESSOR
export HOMEBREW_PRODUCT
export HOMEBREW_OS_VERSION
export HOMEBREW_MACOS_VERSION
export HOMEBREW_USER_AGENT
export HOMEBREW_USER_AGENT_CURL

if [[ -n "$HOMEBREW_MACOS" && -x "/usr/bin/xcode-select" ]]
then
  XCODE_SELECT_PATH=$('/usr/bin/xcode-select' --print-path 2>/dev/null)
  if [[ "$XCODE_SELECT_PATH" = "/" ]]
  then
    odie <<EOS
Your xcode-select path is currently set to '/'.
This causes the 'xcrun' tool to hang, and can render Homebrew unusable.
If you are using Xcode, you should:
  sudo xcode-select -switch /Applications/Xcode.app
Otherwise, you should:
  sudo rm -rf /usr/share/xcode-select
EOS
  fi

  # Don't check xcrun if Xcode and the CLT aren't installed, as that opens
  # a popup window asking the user to install the CLT
  if [[ -n "$XCODE_SELECT_PATH" ]]
  then
    XCRUN_OUTPUT="$(/usr/bin/xcrun clang 2>&1)"
    XCRUN_STATUS="$?"

    if [[ "$XCRUN_STATUS" -ne 0 && "$XCRUN_OUTPUT" = *license* ]]
    then
      odie <<EOS
You have not agreed to the Xcode license. Please resolve this by running:
  sudo xcodebuild -license accept
EOS
    fi
  fi
fi

# Many Pathname operations use getwd when they shouldn't, and then throw
# odd exceptions. Reduce our support burden by showing a user-friendly error.
if [[ ! -d "$(pwd)" ]]
then
  odie "The current working directory doesn't exist, cannot proceed."
fi

if [[ "$1" = -v ]]
then
  # Shift the -v to the end of the parameter list
  shift
  set -- "$@" -v
fi

for arg in "$@"
do
  if [[ $arg = "--help" || $arg = "-h" || $arg = "--usage" || $arg = "-?" ]]
  then
    export HOMEBREW_HELP="1"
    break
  fi
done

HOMEBREW_ARG_COUNT="$#"
HOMEBREW_COMMAND="$1"
shift
case "$HOMEBREW_COMMAND" in
  ls)          HOMEBREW_COMMAND="list" ;;
  homepage)    HOMEBREW_COMMAND="home" ;;
  -S)          HOMEBREW_COMMAND="search" ;;
  up)          HOMEBREW_COMMAND="update" ;;
  ln)          HOMEBREW_COMMAND="link" ;;
  instal)      HOMEBREW_COMMAND="install" ;; # gem does the same
  uninstal)    HOMEBREW_COMMAND="uninstall" ;;
  rm)          HOMEBREW_COMMAND="uninstall" ;;
  remove)      HOMEBREW_COMMAND="uninstall" ;;
  configure)   HOMEBREW_COMMAND="diy" ;;
  abv)         HOMEBREW_COMMAND="info" ;;
  dr)          HOMEBREW_COMMAND="doctor" ;;
  --repo)      HOMEBREW_COMMAND="--repository" ;;
  environment) HOMEBREW_COMMAND="--env" ;;
  --config)    HOMEBREW_COMMAND="config" ;;
esac

if [[ -z "$HOMEBREW_DEVELOPER" ]]
then
  export HOMEBREW_GIT_CONFIG_FILE="$HOMEBREW_REPOSITORY/.git/config"
  HOMEBREW_GIT_CONFIG_DEVELOPERMODE="$(git config --file="$HOMEBREW_GIT_CONFIG_FILE" --get homebrew.devcmdrun 2>/dev/null)"
  if [[ "$HOMEBREW_GIT_CONFIG_DEVELOPERMODE" = "true" ]]
  then
    export HOMEBREW_DEV_CMD_RUN="1"
  fi
fi

if [[ -f "$HOMEBREW_LIBRARY/Homebrew/cmd/$HOMEBREW_COMMAND.sh" ]]
then
  HOMEBREW_BASH_COMMAND="$HOMEBREW_LIBRARY/Homebrew/cmd/$HOMEBREW_COMMAND.sh"
elif [[ -f "$HOMEBREW_LIBRARY/Homebrew/dev-cmd/$HOMEBREW_COMMAND.sh" ]]
then
  if [[ -z "$HOMEBREW_DEVELOPER" ]]
  then
    git config --file="$HOMEBREW_GIT_CONFIG_FILE" --replace-all homebrew.devcmdrun true 2>/dev/null
    export HOMEBREW_DEV_CMD_RUN="1"
  fi
  HOMEBREW_BASH_COMMAND="$HOMEBREW_LIBRARY/Homebrew/dev-cmd/$HOMEBREW_COMMAND.sh"
fi

check-run-command-as-root() {
  [[ "$(id -u)" = 0 ]] || return

  # Homebrew Services may need `sudo` for system-wide daemons.
  [[ "$HOMEBREW_COMMAND" = "services" ]] && return

  # It's fine to run this as root as it's not changing anything.
  [[ "$HOMEBREW_COMMAND" = "--prefix" ]] && return

  odie <<EOS
Running Homebrew as root is extremely dangerous and no longer supported.
As Homebrew does not drop privileges on installation you would be giving all
build scripts full access to your system.
EOS
}
check-run-command-as-root

if [[ "$HOMEBREW_PREFIX" = "/usr/local" &&
      "$HOMEBREW_PREFIX" != "$HOMEBREW_REPOSITORY" &&
      "$HOMEBREW_CELLAR" = "$HOMEBREW_REPOSITORY/Cellar" ]]
then
  cat >&2 <<EOS
Warning: your HOMEBREW_PREFIX is set to /usr/local but HOMEBREW_CELLAR is set
to $HOMEBREW_CELLAR. Your current HOMEBREW_CELLAR location will stop
you being able to use all the binary packages (bottles) Homebrew provides. We
recommend you move your HOMEBREW_CELLAR to /usr/local/Cellar which will get you
access to all bottles."
EOS
fi

# Hide shellcheck complaint:
# shellcheck source=/dev/null
source "$HOMEBREW_LIBRARY/Homebrew/utils/analytics.sh"
setup-analytics

# Let user know we're still updating Homebrew if brew update --preinstall
# exceeds 3 seconds.
update-preinstall-timer() {
  sleep 3
  echo 'Updating Homebrew...' >&2
}

update-preinstall() {
  [[ -z "$HOMEBREW_HELP" ]] || return
  [[ -z "$HOMEBREW_NO_AUTO_UPDATE" ]] || return
  [[ -z "$HOMEBREW_UPDATE_PREINSTALL" ]] || return

  # Allow auto-update migration now we have a fix in place (below in this function).
  export HOMEBREW_ENABLE_AUTO_UPDATE_MIGRATION="1"

  if [[ "$HOMEBREW_COMMAND" = "install" || "$HOMEBREW_COMMAND" = "upgrade" || "$HOMEBREW_COMMAND" = "tap" ]]
  then
    if [[ -z "$HOMEBREW_VERBOSE" ]]
    then
      update-preinstall-timer &
      timer_pid=$!
    fi

    brew update --preinstall

    if [[ -n "$timer_pid" ]]
    then
      kill "$timer_pid" 2>/dev/null
      wait "$timer_pid" 2>/dev/null
    fi
  fi

  # If brew update --preinstall did a migration then export the new locations.
  if [[ "$HOMEBREW_REPOSITORY" = "/usr/local" &&
        ! -d "$HOMEBREW_REPOSITORY/.git" &&
        -d "/usr/local/Homebrew/.git" ]]
  then
    HOMEBREW_REPOSITORY="/usr/local/Homebrew"
    HOMEBREW_LIBRARY="$HOMEBREW_REPOSITORY/Library"
    export HOMEBREW_REPOSITORY
    export HOMEBREW_LIBRARY
  fi

  # If we've checked for updates, we don't need to check again.
  export HOMEBREW_NO_AUTO_UPDATE="1"
}

if [[ -n "$HOMEBREW_BASH_COMMAND" ]]
then
  # source rather than executing directly to ensure the entire file is read into
  # memory before it is run. This makes running a Bash script behave more like
  # a Ruby script and avoids hard-to-debug issues if the Bash script is updated
  # at the same time as being run.
  #
  # Hide shellcheck complaint:
  # shellcheck source=/dev/null
  source "$HOMEBREW_BASH_COMMAND"
  { update-preinstall; "homebrew-$HOMEBREW_COMMAND" "$@"; exit $?; }
else
  # Hide shellcheck complaint:
  # shellcheck source=/dev/null
  source "$HOMEBREW_LIBRARY/Homebrew/utils/ruby.sh"
  setup-ruby-path

  # Unshift command back into argument list (unless argument list was empty).
  [[ "$HOMEBREW_ARG_COUNT" -gt 0 ]] && set -- "$HOMEBREW_COMMAND" "$@"
  { update-preinstall; exec "$HOMEBREW_RUBY_PATH" -W0 "$HOMEBREW_LIBRARY/Homebrew/brew.rb" "$@"; }
fi